Don't merge: choose Function Executor port randomly

This is a hack to allow running multiple Executors on the same machine.

python-sdk/indexify/executor/function_executor/server/subprocess_function_executor_server_factory.py

@@ -2,6 +2,7 @@
 import os
 import signal
 from typing import Any, Optional
+import random
 
 from .function_executor_server_factory import (
     FunctionExecutorServerConfiguration,
@@ -98,7 +99,9 @@ async def destroy(
     def _allocate_port(self) -> int:
         # No asyncio.Lock is required here because this operation never awaits
         # and it is always called from the same thread where the event loop is running.
-        return self._free_ports.pop()
+        port = random.choice(tuple(self._free_ports))
+        self._free_ports.remove(port)
+        return port
 
     def _release_port(self, port: int) -> None:
         # No asyncio.Lock is required here because this operation never awaits